Data mapping method and apparatus in wireless communication system

ABSTRACT

A method, performed by a base station, of transmitting and receiving data in a wireless communication system, and an apparatus therefor are provided. The method includes determining whether a code block (CB), one of a plurality of CBs included in a transport block (TB), is scheduled for a transmission based on code block group transmission information (CBGTI), in response to the CB being scheduled for the transmission, determining a length of a sequence for the CB based on a number of CBs of the TB or a number of scheduled CBs of the TB, generating the sequence for the CB according to the determined length of the sequence, and transmitting a signal including the generated sequence.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is based on and claims priority under 35 U.S.C. § 119of a Korean patent application number 10-2017-0158966, filed on Nov. 24,2017, in the Korean Intellectual Property Office, the disclosure ofwhich is incorporated by reference herein in its entirety.

BACKGROUND 1. Field

The disclosure relates to data mapping methods and apparatuses in awireless communication system. More particularly, the disclosure relatesto a data mapping method and apparatus for smoothly providing a servicein a wireless communication system.

2. Description of Related Art

To meet the increase in demand for wireless data traffic after thecommercialization of 4th generation (4G) communication systems,considerable efforts have been made to develop pre-5th generation (5G)communication systems or 5G communication systems. This is one reasonwhy “5G communication systems” or “pre-5G communication systems” arecalled “beyond 4G network communication systems” or “post long-termevolution (LTE) systems”. In order to achieve a high data transmissionrate, 5G communication systems are being developed to be implemented ina super-high frequency band (millimeter wave (mmWave)), e.g., a band of60 GHz. In order to reduce the occurrence of stray electric waves insuch a super-high frequency band and to increase a transmission distanceof electric waves in 5G communication systems, various technologies arebeing studied, for example, beamforming, massive multiple input multipleoutput (MIMO), full dimensional MIMO (FD-MIMO), array antennas, analogbeam-forming, and large scale antennas. In order to improve systemnetworks for 5G communication systems, various technologies have beendeveloped, including evolved small cells, advanced small cells, cloudradio access networks (cloud RAN), ultra-dense networks,device-to-device communication (D2D), wireless backhaul, movingnetworks, cooperative communication, coordinated multi-points (CoMP),and interference cancellation. Also, for 5G communication systems, othertechnologies have been developed, including hybrid modulation offrequency-shift keying (FSK) and quadrature amplitude modulation (QAM)(FQAM) and sliding window superposition coding (SWSC), which areadvanced coding modulation (ACM) schemes, and filter bank multi carrier(FBMC), non-orthogonal multiple access (NOMA), and sparse code multipleaccess (SCMA), which are advanced access schemes.

The internet has evolved from a human-based connection network, wherehumans create and consume information, to the internet of things (IoT),where distributed configurations, such as objects, exchange informationwith each other to process the information. Internet of everything (IoE)technology is being newly provided, in which technology related to theIoT is combined with, for example, technology for processing big datathrough connection with a cloud server. In order to implement the IoT,various technical components are required, such as, a sensing technique,wired/wireless communication and network infrastructures, a serviceinterfacing technique, a security technique, etc. In recent years,techniques including a sensor network for connecting objects, machine tomachine (M2M) communication, machine type communication (MTC), etc. havebeen studied. In the IoT environment, intelligent internet technology(IT) services may be provided to collect and analyze data obtained fromobjects connected to each other and thus to create new value in humanlife. As existing information technology (IT) techniques and variousindustries converge and combine with each other, the IoT may be appliedto various fields, such as smart homes, smart buildings, smart cities,smart cars or connected cars, smart grids, health care, smart homeappliances, high quality medical services, etc.

Various attempts are being made to apply 5G communication systems to theIoT network. For example, technologies related to sensor networks, M2Mcommunication, MTC, etc., are implemented by using 5G communicationtechnology including beam-forming, MIMO, array antenna, etc. Theapplication of the cloud RAN as a big data processing techniquedescribed above may be an example of convergence of 5G communicationtechnology and IoT technology.

As described above, with the development of wireless communicationsystems, various services are now providable, and thus, a way ofsmoothly providing these services is required.

The above information is presented as background information only toassist with an understanding of the disclosure. No determination hasbeen made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the disclosure.

SUMMARY

Aspects of the disclosure are to address at least the above-mentionedproblems and/or disadvantages and to provide at least the advantagesdescribed below. Accordingly, an aspect of the disclosure is to providedata mapping methods and apparatuses for smoothly providing a service ina wireless communication system.

In accordance with an aspect of the disclosure, a method, performed by abase station, of transmitting and receiving data in a wirelesscommunication system is provided. The method includes determiningwhether a code block (CB), one of a plurality of CBs included in atransport block (TB), is scheduled for a transmission based on codeblock group transmission information (CBGTI), in response to the CBbeing scheduled for the transmission, determining a length of a sequencefor the CB based on a number of CBs of the TB or a number of scheduledCBs of the TB, generating the sequence for the CB according to thedetermined length of the sequence, and transmitting a signal includingthe generated sequence.

The method may further include, in response to the CB not beingscheduled for the transmission, determining the length of a sequence forthe CB as 0.

The method may further include, in response to the CBGTI not beingpresent in downlink control information (DCI) scheduling of the TB,determining the length of the sequence for the CB based on the number ofCBs of the TB, and in response to the CBGTI being present in the DCI,determining the length of the sequence for the CB based on the number ofscheduled CBs of the TB.

The length of the sequence for the CB may be determined as

${{N_{L} \cdot Q_{m} \cdot \left\lfloor \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rfloor}\mspace{14mu}{or}\mspace{14mu}{N_{L} \cdot Q_{m} \cdot \left\lceil \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rceil}},N_{L}$may be the number of transmission layers mapped with the TB, Q_(m) maybe the modulation order, G may be the total number of coded bitsavailable for a transmission of the TB, C′ may be the number of CBs ofthe TBs in response to the CBGTI being not present in the DCI, and C′may be the number of the scheduled CBs of the TBs in response to theCBGTI being present in the DCI.

In accordance with another aspect of the disclosure, a method, performedby a user equipment (UE) of transmitting and receiving data in awireless communication system is provided. The method includes receivingcode block group transmission information (CBGTI) for at least one codeblock (CB) included in a transport block (TB), determining a length of asequence for the at least one CB based on the number of CBs of the TB orthe number of scheduled CBs of the TB according to the CBGTI, anddecoding the at least one CB based on the determined length of thesequence.

The method may further include, in response to the CBGTI not beingpresent in downlink control information (DCI) scheduling the TB,determining the length of the sequence for the CB based on the number ofCBs of the TB, and in response to the CBGTI being present in the DCI,determining the length of the sequence for the CB based on the number ofscheduled CBs of the TB.

The length of the sequence for the CB may be determined as

${{N_{L} \cdot Q_{m} \cdot \left\lfloor \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rfloor}\mspace{14mu}{or}\mspace{14mu}{N_{L} \cdot Q_{m} \cdot \left\lceil \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rceil}},N_{L}$may be the number of transmission layers mapped with the TB, Q_(m) maybe the modulation order, G may be the total number of coded bitsavailable for a transmission of the TB, C′ may be the number of CBs ofthe TBs in response to the CBGTI being not present in the DCI, and C′may be the number of the scheduled CBs of the TBs in response to theCBGTI being present in the DCI.

In accordance with another aspect of the disclosure, a base station fortransmitting and receiving data in a wireless communication system isprovided. The base station includes a transceiver, at least one memorystoring instructions, and at least one processor configured to executethe stored instructions to determine whether a code block (CB), one of aplurality of CBs included in a transport block (TB), is scheduled for atransmission based on code block group transmission information (CBGTI),in response to the CB being scheduled for the transmission, determine alength of a sequence for the CB based on a number of CBs of the TB or anumber of scheduled CBs of the TB, generate the sequence for the CBaccording to the determined length of the sequence, and control thetransceiver to transmit a signal including the generated sequence.

The at least one processor may further be configured to execute thestored instructions to, in response to the CB not being scheduled forthe transmission, determine the length of a sequence for the CB as 0.

The at least one processor may further be configured to, in response tothe CBGTI not being present in downlink control information (DCI)scheduling of the TB, determine the length of a sequence for the CBbased on the number of CBs of the TB, and in response to the CBGTI beingpresent in the DCI, determine the length of the sequence for the CBbased on the number of scheduled CBs of the TB.

The length of the sequence for the CB may be determined as

${{N_{L} \cdot Q_{m} \cdot \left\lfloor \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rfloor}\mspace{14mu}{or}\mspace{14mu}{N_{L} \cdot Q_{m} \cdot \left\lceil \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rceil}},N_{L}$may be the number of transmission layers mapped with the TB, Q_(m) maybe the modulation order, G may be the total number of coded bitsavailable for a transmission of the TB, C′ may be the number of CBs ofthe TBs in response to the CBGTI being not present in the DCI, and C′may be the number of the scheduled CBs of the TBs in response to theCBGTI being present in the DCI.

In accordance with another aspect of the disclosure, a user equipment(UE) for transmitting and receiving data in a wireless communicationsystem is provided. The UE includes a transceiver, at least one memorystoring instructions, and at least one processor configured to executethe stored instructions to receive code block group transmissioninformation (CBGTI) for at least one code block (CB) included in atransport block (TB), determine a length of a sequence for the at leastone CB based on the number of CBs of the TB or the number of scheduledCBs of the TB according to the CBGTI, and decode the at least one CBbased on the determined length of the sequence.

The at least one processor may further be configured to, in response tothe CBGTI not being present in downlink control information (DCI)scheduling of the TB, determine the length of a sequence for the CBbased on the number of CBs of the TB, and in response to the CBGTI beingpresent in the DCI, determine the length of the sequence for the CBbased on the number of scheduled CBs of the TB.

The length of the sequence for the CB may be determined as

${{N_{L} \cdot Q_{m} \cdot \left\lfloor \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rfloor}\mspace{14mu}{or}\mspace{14mu}{N_{L} \cdot Q_{m} \cdot \left\lceil \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rceil}},N_{L}$may be the number of transmission layers mapped with the TB, Q_(m) maybe the modulation order, G may be the total number of coded bitsavailable for a transmission of the TB, C′ may be the number of CBs ofthe TBs in response to the CBGTI being not present in the DCI, and C′may be the number of the scheduled CBs of the TBs in response to theCBGTI being present in the DCI.

According to another aspect of the disclosure, a non-transitorycomputer-readable recording medium having an executable program recordedthereon, wherein the program instructs a computer to perform the methodof claim 1.

Other aspects, advantages, and salient features of the disclosure willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the disclosure will be more apparent from the followingdescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is a diagram of a transmission structure of a time-frequencydomain that is a downlink (DL) wireless resource region of a long-termevolution (LTE) system, an LTE-advanced (LTE-A) system, or a similarsystem according to an embodiment of the disclosure;

FIG. 2 is a diagram of a transmission structure of a time-frequencydomain that is an uplink (UL) wireless resource region of an LTE system,an LTE-A system, or a similar system according to an embodiment of thedisclosure;

FIGS. 3 and 4 are diagrams for describing a method of assigning enhancedmobile broadband (eMBB), ultra-reliable and low-latency communications(URLLC), and massive machine-type communications (mMTC), which areservices considered in a 5^(th) generation (5G) or new radio (NR)system, in time-frequency resources according to various embodiments ofthe disclosure;

FIG. 5 is a diagram of a structure in which one transport block isdivided into a plurality of code blocks and a cycle redundancy check(CRC) is added, according to an embodiment of the disclosure;

FIG. 6 illustrates a transmission method using an outer code, accordingto an embodiment of the disclosure;

FIGS. 7A and 7B are diagrams for describing operation processes based onwhether an outer code is applied, according to various embodiments ofthe disclosure;

FIGS. 8A, 8B, and 8C are diagrams of examples of partial retransmissionaccording to various embodiments of the disclosure;

FIG. 9 is a block diagram for describing operations related to channelcoding performed until a transport block to be transmitted is actuallytransmitted, according to an embodiment of the disclosure;

FIG. 10 is a flowchart of a method of determining a rate matchingparameter, according to an embodiment of the disclosure;

FIG. 11 is a flowchart of a method of determining a rate matchingparameter, according to an embodiment of the disclosure;

FIG. 12 is a flowchart of a method of determining a rate matchingparameter, according to an embodiment of the disclosure;

FIG. 13 is a block diagram of an internal configuration of a terminal,according to an embodiment of the disclosure; and

FIG. 14 is a block diagram of an internal configuration of a basestation, according to an embodiment of the disclosure.

Throughout the drawings, like reference numerals will be understood torefer to like parts, components, and structures.

DETAILED DESCRIPTION

The following description with reference to accompanying drawings isprovided to assist in a comprehensive understanding of variousembodiments of the disclosure as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the various embodiments describedherein can be made without departing from the scope and spirit of thedisclosure. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of thedisclosure. Accordingly, it should be apparent to those skilled in theart that the following description of various embodiments of thedisclosure is provided for illustration purpose only and not for thepurpose of limiting the disclosure as defined by the appended claims andtheir equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

While describing the embodiments, technical content that is well-knownin the related fields and not directly related to the disclosure willnot be provided. By omitting redundant descriptions, the essence of thedisclosure will not be obscured and may be clearly explained.

For the same reasons, components may be exaggerated, omitted, orschematically illustrated in drawings for clarity. Also, the size ofeach component does not completely reflect the actual size. In thedrawings, like reference numerals denote like elements.

Expressions such as “at least one of,” when preceding a list ofelements, modify the entire list of elements and do not modify theindividual elements of the list.

Advantages and features of one or more embodiments of the disclosure andmethods of accomplishing the same may be understood more readily byreference to the following detailed description of the embodiments andthe accompanying drawings. In this regard, the embodiments may havedifferent forms and should not be construed as being limited to thedescriptions set forth herein. Rather, these embodiments are provided sothat this disclosure will be thorough and complete and will fully conveythe concept of the embodiments to one of ordinary skill in the art, andthe disclosure will only be defined by the appended claims.

Here, it will be understood that combinations of blocks in flowcharts orprocess flow diagrams may be performed by computer program instructions.Since these computer program instructions may be loaded into a processorof a general purpose computer, a special purpose computer, or anotherprogrammable data processing apparatus, the instructions, which areperformed by a processor of a computer or another programmable dataprocessing apparatus, create units for performing functions described inthe flowchart block(s). The computer program instructions may be storedin a computer-usable or computer-readable memory capable of directing acomputer or another programmable data processing apparatus to implementa function in a particular manner, and thus the instructions stored inthe computer-usable or computer-readable memory may also be capable ofproducing manufacturing items containing instruction units forperforming the functions described in the flowchart block(s). Thecomputer program instructions may also be loaded into a computer oranother programmable data processing apparatus, and thus, instructionsfor operating the computer or the other programmable data processingapparatus by generating a computer-executed process when a series ofoperations are performed in the computer or the other programmable dataprocessing apparatus may provide operations for performing the functionsdescribed in the flowchart block(s).

In addition, each block may represent a portion of a module, segment, orcode that includes one or more executable instructions for executingspecified logical function(s). It should also be noted that in somealternative implementations, functions mentioned in blocks may occur outof order. For example, two blocks illustrated successively may actuallybe executed substantially concurrently, or the blocks may sometimes beperformed in a reverse order according to the corresponding function.

The term “unit” in the embodiments of the disclosure means a softwarecomponent or hardware component such as a field-programmable gate array(FPGA) or an application-specific integrated circuit (ASIC), andperforms a specific function. However, the term “unit” is not limited tosoftware or hardware. The unit may be formed so as to be in anaddressable storage medium, or may be formed so as to operate one ormore processors. Thus, for example, the term “unit” may refer tocomponents such as software components, object-oriented softwarecomponents, class components, and task components, and may includeprocesses, functions, attributes, procedures, subroutines, segments ofprogram code, drivers, firmware, micro codes, circuits, data, adatabase, data structures, tables, arrays, or variables. A functionprovided by the components and units may be associated with the smallernumber of components and units, or may be divided into additionalcomponents and units. Furthermore, the components and units may beembodied to reproduce one or more central processing units (CPUs) in adevice or security multimedia card. Also, in the embodiments, the unitmay include at least one processor.

A wireless communication system has evolved from providing initialvoice-oriented services to, for example, a broadband wirelesscommunication system providing a high-speed and high-quality packet dataservice, such as communication standards of high speed packet access(HSPA), long-term evolution (LTE) or evolved universal terrestrial radioaccess (E-UTRA), and LTE-advanced (LTE-A) of third generationpartnership project (3GPP), high rate packet data (HRPD) and ultramobile broadband (UMB) of 3GPP2, and 802.16e of Institute of Electricaland Electronics Engineers (IEEE). A 5^(th) generation (5G) or new radio(NR) communication standards are being developed with 5G wirelesscommunication systems.

In an LTE system that is a representative example of the broadbandwireless communication system, an orthogonal frequency divisionmultiplexing (OFDM) scheme is used in a downlink (DL) and a singlecarrier frequency division multiplexing (SC-FDMA) scheme is used in anuplink (UL). The UL refers to a wireless link through which a terminal,user equipment (UE), or a mobile station (MS) transmits data or controlsignals to a base station (BS) or an evolved node B (eNode B), and theDL refers to a wireless link through which a BS transmits data orcontrol signals to a terminal. In such a multiple access scheme, data orcontrol information of each user is classified by generally assigningand operating the data or control information such that time-frequencyresources for transmitting data or control information for each user donot overlap each other, i.e., such that orthogonality is established.

An LTE system employs a hybrid automatic repeat request (HARQ) scheme inwhich a physical layer retransmits data when a decoding failure occursin initial transmission. In the HARQ scheme, when a receiver fails toaccurately decode data, the receiver transmits information (negativeacknowledgment (NACK)) indicating the decoding failure to thetransmitter so that the transmitter may retransmit the correspondingdata in the physical layer. The receiver combines the data retransmittedby the transmitter with the data whose previous decoding had failed soas to improve data reception performance. In addition, when the receiveraccurately decodes the data, information (acknowledgment (ACK))indicating successful decoding is transmitted to the transmitter so thatthe transmitter may transmit new data.

All terms including descriptive or technical terms which are used hereinshould be construed as having meanings that are obvious to one ofordinary skill in the art. However, the terms may have differentmeanings according to an intention of one of ordinary skill in the art,precedent cases, or the appearance of new technologies, and thus, theterms used herein have to be defined based on the meaning of the termstogether with the description throughout the specification. Hereinafter,a BS may be a subject performing resource assignment of a terminal, andmay be at least one of a gNode B, an eNode B, a Node B, a BS, a wirelessaccess unit, a BS controller, and a node on a network. A terminal mayinclude UE, an MS, a cellular phone, a smart phone, a computer, or amultimedia system capable of performing communication functions. In thedisclosure, a DL is a wireless transmission path of a signal transmittedfrom a BS to a terminal, and a UL is a wireless transmission path of asignal transmitted from a terminal to a BS. Also, one or moreembodiments of the disclosure will be described as an example of an LTEor LTE-A system, but the one or more embodiments may also be applied toother communication systems having a similar technical background orchannel form. For example, 5G mobile communication technology (5G, newradio, NR) developed after LTE-A may be included. In addition, the oneor more embodiments may be applied to other communication systemsthrough some modifications within the scope of the disclosure withoutdeparting from the scope of the disclosure by the judgment of a personof ordinary skill in the art.

In the disclosure, a transmission time interval (TTI) may denote a unitin which a control signal and a data signal are transmitted, or denote aunit in which a data signal is transmitted. For example, a TTI in a DLof an existing LTE system is a sub-frame that is a time unit of 1 ms.Meanwhile, in the disclosure, a TTI in a UL may denote a unit in which acontrol signal and a data signal are transmitted, or denote a unit inwhich a data signal is transmitted. A TTI in a UL of the existing LTEsystem is also a sub-frame that is a time unit of 1 ms like the DL.Meanwhile, in a 5G or NR system, a TTI for data transmission may be aslot or a mini-slot.

Terms such as a physical channel and a signal in an existing LTE orLTE-A system may be used to describe methods and apparatuses suggestedin the disclosure. However, the content of the disclosure is applied toa wireless communication system, instead of the LTE or LTE-A system.

In the disclosure, a UL scheduling approval signal and a DL data signalare referred to as a first signal. Also, in the disclosure, a UL datasignal with respect to UL scheduling approval and HARQ ACK/NACK withrespect to a DL data signal are referred to as a second signal. In thedisclosure, among signals transmitted from a BS to a terminal, a signalexpecting a response from the terminal may be the first signal and aresponse signal of the terminal with respect to the first signal may bethe second signal. Also, in the disclosure, a service type of the firstsignal may be in a category of enhanced mobile broadband (eMBB), massivemachine-type communications (mMTC), and ultra-reliable and low-latencycommunications (URLLC).

Hereinafter, in the disclosure, a TTI length of the first signal denotesa length of time taken for the first signal to be transmitted. Also, inthe disclosure, a TTI length of the second signal denotes a length oftime taken for the second signal to be transmitted. Also, in thedisclosure, a second signal transmission timing is information aboutwhen the terminal transmits the second signal and when the BS receivesthe second signal, and may be referred to as a second signaltransmission and reception timing.

In the disclosure, it may be understood that, generally, a frequencydivision duplex (FDD) system is described, unless a time division duplex(TDD) system is mentioned. However, descriptions about the FDD systemmay also be applied to the TDD system via simple modification.

Hereinafter, in the disclosure, a higher signaling is a method oftransmitting a signal from a BS to a terminal by using a DL data channelof a physical layer or from a terminal to a BS by using a UL datachannel of a physical layer, and may also be referred to as radioresource control (RRC) signaling or medium access control (MAC) controlelement (CE).

FIG. 1 is a diagram of a transmission structure of a time-frequencydomain that is a DL wireless resource region of a LTE system or asimilar system according to an embodiment of the disclosure.

Referring to FIG. 1, a horizontal axis represents a time domain and avertical axis represents a frequency domain in a wireless resourceregion. In the time domain, the minimum transmission unit is an OFDMsymbol, and N_(symb) OFDM symbols 1-02 are gathered to constitute oneslot 1-06, and two slots are gathered to constitute one sub-frame 1-05.The length of the slot is 0.5 ms, and the length of the sub-frame is 0.1ms. A radio frame 1-14 is a time domain interval composed of 10sub-frames. The minimum transmission unit in the frequency domain is asubcarrier, and the transmission bandwidth of the whole system iscomposed of N_(RB) ^(DL) subcarriers 1-04 in total. However, suchspecific numerical values may vary according to a system.

In the time-frequency domain, a basic unit of a resource is a resourceelement (RE) 1-12, and may be indicated as an OFDM symbol index and asubcarrier index. A resource block (RB) 1-08 or a PRB is defined asN_(symb) successive OFDM symbols 1-02 in the time domain and N_(RB)successive subcarriers 1-10 in the frequency domain. Accordingly, one RB1-08 is composed of N_(symb)×N_(RB) REs 1-12 in one slot.

In general, the minimum transmission unit of data is RB, and in the LTEsystem, it is general that N_(symb) is 7 and N_(RB) is 2, and N_(BW) andN_(RB) are in proportion to the system transmission bandwidth. However,a system other than the LTE system may use a different value. A datarate is increased in proportion to the number of RBs being scheduled.

In the LTE system, 6 transmission bandwidths may be defined andoperated. In the case of a FDD system that divides and operates a DL anda UL through a frequency, the transmission bandwidth of the DL and thetransmission bandwidth of the UL may differ from each other. A channelbandwidth indicates a radio frequency (RF) bandwidth that corresponds tothe system transmission bandwidth. Table 1 presents a correspondingrelationship between the system transmission bandwidth defined in theLTE system and the channel bandwidth. For example, in the LTE systemhaving the channel bandwidth of 10 MHz, the transmission bandwidth iscomposed of 50 RBs.

TABLE 1 Channel bandwidth 1.4 3 5 10 15 20 BW_(Channel) [MHz]Transmission 6 15 25 50 75 100 bandwidth configuration N_(RB)

DL control information may be transmitted within first N OFDM symbols ina sub-frame. N={1, 2, 3} in general. Accordingly, in accordance with theamount of control information to be transmitted in a current sub-frame,the value N may be varied for each sub-frame. The control informationmay include a control channel transmission interval indicator indicatinghow many OFDM symbols the control information is transmitted through,scheduling information on DL data or UL data, and a HARQ ACK/NACKsignal.

In the LTE system, the scheduling information on the DL data or the ULdata is transferred from a BS to a terminal through downlink controlinformation (DCI). The DCI is defined in various formats, and mayindicate, according to each format, whether the scheduling informationis UL data scheduling information (UL grant) or DL data schedulinginformation (DL grant), whether the DCI is compact DCI having a smallsize of control information, whether spatial multiplexing using multipleantennas is applied, or whether the DCI is DCI for controlling power.For example, DCI format 1 that is the scheduling control information (DLgrant) of the DL data may include at least the following controlinformation:

-   -   Resource allocation type 0/1 flag: Indicates whether a resource        allocation type is type 0 or type 1. The type 0 allocates        resources in units of resource block groups (RBGs) through        applying of a bitmap type. In the LTE system, a basic unit of        scheduling is RB that is expressed as a time and frequency        domain resource, and the RBG is composed of a plurality of RBs        to be considered as the basic unit of scheduling in the type 0.        The type 1 allocates a specific RB in the RBG.    -   RB assignment: Indicates RB that is allocated for data        transmission. An expressed resource is determined in accordance        with a system bandwidth and a resource allocation method.    -   Modulation and coding scheme (MCS): indicates a modulation        method used for data transmission and the size of a TB that is        data to be transmitted.    -   HARQ process number: Indicates a process number of HARQ.    -   New data indicator: Indicates whether HARQ transmission is        initial transmission or retransmission.    -   Redundancy version: Indicates a redundancy version of HARQ.    -   Transmit power control (TPC) command for physical uplink control        channel (PUCCH): Indicates a transmission power control command        for a PUCCH that is a UL control channel.

The DCI may be transmitted through a physical downlink control channel(PDCCH) (or control information, hereinafter, mixedly used) that is a DLphysical control channel or an enhanced PDCCH (EPDCCH) (or enhancedcontrol information, hereinafter, mixedly used) after passing through achannel coding and modulation process.

In general, the DCI is scrambled by a specific radio network temporaryidentifier (RNTI) or terminal identifier independently with respect toeach terminal, is added with a cyclic redundancy check (CRC), ischannel-coded, and then is configured as an independent PDCCH to betransmitted. In the time domain, the PDCCH is mapped and transmitted forthe control channel transmission interval. A mapping location of thePDCCH in the frequency domain is determined by the identifier (ID) ofeach terminal, and the PDCCH may be transmitted through the transmissionband of the whole system.

The DL data may be transmitted through a physical downlink sharedchannel (PDSCH) that is a physical channel for transmitting the DL data.The PDSCH may be transmitted after the control channel transmissioninterval, and scheduling information, such as a concrete mappinglocation or a modulation method in the frequency domain, may be includedin the DCI to be transmitted through the PDCCH.

The BS notifies the terminal of a modulation method applied to the PDSCHto be transmitted and a transport block size (TBS) to be transmitted, byusing an MCS among the control information constituting the DCI. The MCSmay be composed of 5 bits, or may be composed of another number of bits.The TBS corresponds to the size before channel coding for errorcorrection is applied to the TB to be transmitted by the BS.

According to an embodiment a TB may include a MAC header, a MAC CE, atleast one MAC service data unit (SDU), and padding bits. Also, a TB mayindicate a unit of data or MAC protocol data unit (PDU) transmitted froma MAC layer to a physical layer.

The modulation method supported in the LTE system is quadrature phaseshift keying (QPSK), 16 quadrature amplitude modulation (16QAM), or64QAM, and respective modulation orders (Q_(m)) correspond to 2, 4, and6. In the case of the QPSK modulation, 2 bits per symbol may betransmitted, in the case of the 160QAM modulation, 4 bits per symbol maybe transmitted, and in the case of the 64QAM modulation, 6 bits persymbol may be transmitted. Also, a modulation method of 256QAM or moremay be used according to system modification.

FIG. 2 is a diagram of a transmission structure of a time-frequencydomain that is a UL wireless resource region of a LTE system or asimilar system according to an embodiment of the disclosure.

Referring to FIG. 2, a horizontal axis represents a time domain and avertical axis represents a frequency domain in a wireless resourceregion. A radio frame 2-14 is a time domain interval. In the timedomain, the minimum transmission unit in a time domain is a SC-FDMAsymbol 2-02, and N_(symbUL) SC-FDMA symbols are gathered to constituteone slot 2-06. Two slots are gathered to constitute one sub-frame 2-05.The minimum transmission unit in the frequency domain is a subcarrier,and a transmission bandwidth of the whole system is composed of N_(RB)^(UL) subcarriers 2-04 in total. N_(RB) ^(UL) may have a value inproportion to a system transmission bandwidth.

In the time-frequency domain, a basic unit of a resource is a RE 2-12,and may be defined as an SC-FDMA symbol index and a subcarrier index. ARB pair 2-08 is defined as N_(symb) successive SC-FDMA symbols in thetime domain and N_(RB) successive subcarriers 2-10 in the frequencydomain. Accordingly, one RB is composed of N_(symb)×N_(RB) REs. Ingeneral, the minimum transmission unit of data or control information isan RB unit. A PUCCH may be mapped on the frequency domain correspondingto 1 RB, and transmitted for one sub-frame.

In the LTE system, the timing relationship between a PDSCH that is aphysical channel for transmitting DL data or a PDCCH/EPDCCH including asemi-persistent scheduling (SPS) release and a UL physical channel(PUCCH or PUSCH) through which a corresponding HARQ ACK/NACK istransmitted may be defined. As an example, in the LTE system thatoperates as a FDD, the HARQ ACK/NACK corresponding to the PDSCHtransmitted in the (n−4)-th sub-frame or the PDCCH/EPDCCH including theSPS release is transmitted by the PUCCH or PUSCH in the n-th sub-frame.

In the LTE system, a DL HARQ adapts an asynchronous HARQ method in whichdata re-transmission time is not fixed. When the HARQ NACK is fed backfrom the terminal with respect to the initially transmitted datatransmitted by the BS, the BS freely determines the transmission time ofre-transmitted data through the scheduling operation. The terminalbuffers the data that is determined as an error as the result ofdecoding the received data for the HARQ operation, and then performscombining with the next re-transmitted data.

When PDSCH including DL data transmitted from the BS in a sub-frame n isreceived, the terminal transmits UL control information including HARQACK or NACK of the DL data to the BS through PUCCH or PUSCH in asub-frame n+k. k may be differently defined in accordance with FDD ortime division duplex (TDD) of the LTE system and a sub-frameconfiguration. As an example, in an FDD LTE system, k is fixed to 4. Onthe other hand, in a TDD LTE system, k may be changed in accordance withthe sub-frame configuration and a sub-frame number. During datatransmission through a plurality of carriers, the value of k may bedifferently applied in accordance with a TDD configuration of eachcarrier.

In the LTE system, in contrast to DL HARQ, UL HARQ adapts a synchronousHARQ method in which data transmission time is fixed. A UL/DL timingrelationship among a physical uplink shared channel (PUSCH) that is aphysical channel for transmitting the UL data, a PDCCH that is apreceding DL control channel, and a physical hybrid indicator channel(PHICH) that is a physical channel through which the DL HARQ ACK/NACKcorresponding to the PUSCH is transmitted may be fixed by a followingrule.

When the PDCCH including UL scheduling control information transmittedfrom the BS in the sub-frame n or the PHICH through which the DL HARQACK/NACK is transmitted is received, the terminal transmits the UL datacorresponding to the control information through the PUSCH in thesub-frame n+k. k may be differently defined in accordance with the FDDor TDD of the LTE system and its configuration. As an example, in theFDD LTE system, k is fixed to 4. On the other hand, in the TDD LTEsystem, k may be changed in accordance with the sub-frame configurationand the sub-frame number.

In the FDD LTE system, when the BS transmits a UL scheduling approval ora DL control signal and data to the terminal in the sub-frame n, theterminal receives the UL scheduling approval or the DL control signaland data in the sub-frame n. First, when the UL scheduling approval isreceived in the sub-frame n, the terminal transmits the UL data in asub-frame n+4. When the DL control signal and data are received in thesub-frame n, the terminal transmits HARQ ACK or NACK with respect to theDL data in the sub-frame n+4. Accordingly, a preparation time for theterminal to receive the UL scheduling approval and transmit the UL dataor to receive the DL data and transmit the HARQ ACK or NACK is 3 mscorresponding to three sub-frames. Also, when the terminal receives thePHICH that carries the DL HARQ ACK/NACK from the BS in a sub-frame i,the PHICH corresponds to the PUSCH transmitted by the terminal in asub-frame i−k. k is differently defined in accordance with the FDD orTDD of the LTE system and its configuration. As an example, in the FDDLTE system, k is fixed to 4. On the other hand, in the TDD LTE system, kmay be changed in accordance with the sub-frame configuration and thesub-frame number. During data transmission through a plurality ofcarriers, the k value may be differently applied in accordance with theTDD configuration of each carrier.

A wireless communication system has been described above with referenceto an LTE system, but an embodiment is not applied only to the LTEsystem, but may also be applied to various wireless communicationsystems, such as NR and 5G systems. When an embodiment is applied toanother wireless communication system, the value of k may be changedeven in a system using a modulation method corresponding to FDD.

In a 5G or NR access technology system that is a new communicationsystem, various services are designed to be freely multiplexed in timeand frequency resources, and accordingly, waveforms, numerology,reference signals, etc. may be dynamically or freely assigned asrequired by a corresponding service. In order to provide an optimalservice to a terminal in wireless communication, data transmissionoptimized via the quality of a channel and measurement of interferenceis important, and thus, it is essential to accurately measure a channelstate. However, unlike 4G communication in which channel andinterference characteristics are not largely changed according tofrequency resources, channel and interference characteristics may belargely changed according to a service in a 5G or NR system, and thussupport of a subset in terms of a frequency resource group (FRG) isrequired such that the channel and interference characteristics aredivided and measured. Meanwhile, types of services supported in the 5Gor NR system may be divided into categories of eMBB, mMTC, and URLLC.Here, eMBB may be a service targeting high speed transmission of highcapacity data, mMTC may be a service targeting terminal powerconsumption minimization and access of a plurality of terminals, andURLLC may be a service targeting high reliability and low latency.Different requirements may be applied based on a type of service appliedto a terminal.

As such, a plurality of services may be provided to a user in acommunication system, and methods and apparatuses for providing theplurality of services in the same time section are required so as toprovide the plurality of services to the user.

FIGS. 3 and 4 are diagrams for describing a method of assigning eMBB,URLLC, and mMTC, which are services considered in a 5G or NR system, intime-frequency resources according to various embodiments of thedisclosure.

FIGS. 3 and 4 illustrate how frequency and time resources are assignedfor information transmission in each system.

Referring to FIG. 3, eMBB data 3-01, URLLC data 3-03 through 3-07, andmMTC data 3-09 may be assigned in an entire system frequency bandwidth3-00. In a 5G or NR system, when the URLLC data 3-03 through 3-07 aregenerated and need to be transmitted while the eMBB data 3-01 and themMTC data 3-09 are assigned to a certain frequency band and transmitted,regions to which the eMBB data 3-01 and the mMTC data 3-09 are alreadyassigned may be emptied or transmission of the eMBB data 3-01 and themMTC data 3-09 may be stopped at the regions and the URLLC data 3-03through 3-07 may be transmitted. For example, since the URLLC data 3-03through 3-07 corresponds to a service that requires reduction of a delaytime, the URLLC data 3-03 through 3-07 may be transmitted by beingassigned to some of resources to which the eMBB data 3-01 is assigned.When the URLLC data 3-03 through 3-07 are transmitted by beingadditionally assigned to the resources to which the eMBB data 3-01 isassigned, the eMBB data 3-01 may not be transmitted in overlappingtime-frequency resources, and accordingly, transmission performance ofthe eMBB data 3-01 may be decreased. In other words, at this time, atransmission failure of the eMBB data 3-01 may occur due to assignmentof the URLLC data 3-03 through 3-07.

Referring to FIG. 4, in the 5G or NR system, each of sub-bands 4-02through 4-06 divided from an entire system frequency bandwidth 4-00 maybe used to transmit a service and data. Information related to settingof a sub-band may be pre-determined, and such information may betransmitted from a BS to a terminal via higher signaling, according toan embodiment. According to another embodiment, the BS or a network nodemay arbitrarily divide the information and provide services withouttransmitting the information to the terminal). In FIG. 4, the firstsub-band 4-02 is used to transmit eMBB data 4-08, the second sub-band4-04 is used to transmit URLLC data 4-10 through 4-14, and the thirdsub-band 4-06 is used to transmit mMTC data 4-16.

In the current embodiment, a length of TTI taken to transmit the URLLCdata 4-10 through 4-14 may be shorter than a length of TTI taken totransmit the eMBB data 4-08 or the mMTC data 4-16. Also, a response toinformation related to the URLLC data 4-10 through 4-14 may betransmitted faster than in the case of the eMBB data 4-08 or the mMTCdata 4-16, and accordingly, information may be transmitted or receivedwith low latency.

According to an embodiment, a structure of a physical layer channel usedto transmit the above three types of data may vary. For example, atleast one of a length of TTI, an assigning unit of frequency resources,a structure of a control channel, and a data mapping method may vary.

Three types of data have been described in FIGS. 3 and 4, but there maybe more types of services and data corresponding to the services, andthe disclosure may also be applied thereto.

FIG. 5 is a diagram of a structure in which one transport block (TB)5-01 is divided into a plurality of code blocks (CBs) 5-07 through 5-13and a cycle redundancy check (CRC) 5-03 is added, according to anembodiment of the disclosure.

Referring to FIG. 5, the CRC 5-03 may be added at the front or back ofone TB 5-01 to be transmitted in UL or DL. The CRC 5-03 may have 16bits, 24 bits, or a pre-fixed bit number, or may have a bit numbervaried according to a channel state, and may be used to determinewhether channel coding is successful. The TB 5-01 to which the CRC 5-03is added may be divided into the plurality of CBs 5-07 through 5-13 inoperation 5-05. Largest sizes of such CBs 5-07 through 5-13 may bepre-determined, and in this case, the last CB 5-13 may have a sizesmaller than the other CBs 5-07 through 5-11 or may be adjusted to havethe same length as the other CBs 5-07 through 5-11 by having 0, a randomvalue, or 1 inserted into the last CB 5-13. CRCs 5-17 through 5-23 maybe respectively added to the CBs 5-07 through 5-13 in operation 5-15.Each of the CRCs 5-17 through 5-23 may have 16 bits, 24 bits, or apre-fixed number of bits, and may be used to determine the success ofchannel coding. However, the CRC 5-03 added to the TB 5-01 and the CRCs5-17 through 5-23 added to the CBs 5-07 through 5-13 may be omittedaccording to a type of a channel code to be applied to a CB. Forexample, when a low density parity check code (LDPCC) is applied to a CBinstead of a turbo code, the CRCs 5-17 through 5-23 to be addedrespectively to the CBs 5-07 through 5-13 may be omitted. However, theCRCs 5-17 through 5-23 may be added to the CBs 5-07 through 5-13 evenwhen the LDPCC is applied. Also, the CRCs 5-17 through 5-23 may be addedor omitted even when a polar code is used.

As shown in FIG. 5, in a TB to be transmitted, a maximum length of a CBis determined based on a type of channel coding, and a TB and CRC addedto the TB are divided into CBs according to the maximum length of theCB. In an LTE system, a CRC for a CB is added to a CB, coded bits aredetermined as a data bit generated by encoding the CB and CRC via achannel code, and following processes are performed on each of the codedbits to determine a rate-matching bit number. In other words, a parityto be transmitted is determined.

[Start Rate-Matching Bit Number Determination or Transmission BitsCollection]

-   -   Operation 1: Denoting by E the rate matching output sequence        length for the r-th coded block, and by rv_(idx) the redundancy        version number for this transmission (rv_(idx)=0, 1, 2 or 3),        the rate matching output bit sequence being e_(k), k=0, 1, . . .        , E−1.    -   Operation 2: Define by G the total number of bits available for        the transmission of one transport block.    -   Operation 3: Set G′=G/(N_(L)·Q_(m)) where Q_(m) is equal to 2        for QPSK, 4 for 16QAM, 6 for 64QAM and 8 for 256QAM, and where,        for transmission diversity: NI, is equal to 2; otherwise: NI, is        equal to the number of layers a transport block is mapped onto.    -   Operation 4: Set γ=G′ mod C, where C is the number of code        blocks of a TB

  if r ≤ C-r-1  set E = N_(L) · Q_(m) · └G′/C┘ else  set E = N_(L) ·Q_(m) · ┌G′/C┐ end if     ${k_{0} = {R_{subblock}^{TC} \cdot \left( {{2 \cdot \left\lceil \frac{N_{cb}}{8R_{subblock}^{TC}} \right\rceil \cdot {rv}_{idx}} + 2} \right)}},$ Operation 5: Set where R_(subblock) ^(TC) is the number of rows ofblock interleaver,  k = 0 and j = 0  while {k < E}   if w_((k) ₀_(+ j) mod N) _(cb) ≠ < NULL >    e_(k) = w_((k) ₀ ₊ _(j) mod N) _(cb)   k = k + 1   end if  j = j + 1  end while

[End Rate-Matching Bit Number Determination or Transmission BitsCollection]

The operations above may be summarized as follows.

Operation 1: E is defined such that a length of a rate-matching resultof an r-th CB is indicated.

Operation 2: G indicates information bits mappable for transmitting aTB. For example, G may be calculated according to the number of REs towhich TB is mapped*modulation order*a layer number.

Operation 3: G′ is a value obtained by dividing G by the layer numberand the modulation order.

Operation 4: Considering G′, a mappable information bit amount E asclose as possible to all CBs is calculated, and lengths of rate-matchingresults of transmitted CBs are similar per CB.

Operation 5: Mapping information bits are configured such that codedbits of a CB are mapped only by the value E of the length of arate-matching result of a CB calculated in operation 4. When the bitnumber E of the rate-matching result mappable per CB is determined, thetransmittable resource amount G′ is divided by the number of CBsincluded in the TB.

FIG. 6 is a diagram of a structure coded after an outer code is applied,according to an embodiment of the disclosure.

FIGS. 7A and 7B are diagrams for describing operation processes based onwhether an outer code is applied, according to various embodiments ofthe disclosure.

Referring to FIGS. 6, 7A and 7B, a method of transmitting a signal byusing an outer code will be described.

Referring to FIG. 6, a TB is divided into several CBs, and bits orsymbols 6-04 that are at the same location in the respective CBs may beencoded with a second channel code to generate parity bits or symbols6-06 (6-02). Thereafter, CRCs may be added to the respective CBs andparity CBs generated through second channel code encoding (6-08 and6-10). The addition of the CRCs may differ depending on a type of achannel code. For example, when a turbo code is used as a first channelcode, the CRCs are added in operations 6-08 and 6-10, but thereafter,the respective CBs and parity CBs may be encoded through first channelcode encoding. Here, a TB may be one TB transferred from an upper layerto a physical layer. In the physical layer, the TB is considered asdata. First, the CRC is added to the TB. In order to generate the CRC,TB data bits and a cyclic generator polynomial may be used, and thecyclic generator polynomial may be defined by various methods. Forexample, when the cyclic generator polynomial for a 24-bit CRC isg_(CRC24A)(D)=D²⁴+D²³+D¹⁸+D¹⁷+D¹⁴+D¹¹+D¹⁰+D⁷±D⁶+D⁵+D⁴+D³+D¹ and L isL=24, the CRC p₀, p₁, p₂, p₃, . . . , p_(L-1) is determined as a valueobtained by dividing a₀D^(A+23)+a₁D^(A+22)+ . . .+a_(A-1)D²⁴+p₀D²³+p₁D²²+ . . . +p₂₂D¹+p₂₃ by g_(CRC24A)(D) with theremainder of 0 with respect to TB data a₀, a₁, a₂, a₃, . . . , a_(A-1).In the above-described example, although the CRC length L=24, variouslengths, such as, 12, 16, 32, 40, 48, and 64 may be used. The CRCs areadded to the divided CBs, and a cyclic generator polynomial that isdifferent from that of the CRC of the TB may be used as the CRC of theCB.

In an LTE system, during retransmission due to an initial transmissionfailure, the initially transmitted TB is retransmitted. According to anembodiment, retransmission in a unit of a CB or several CBs, rather thanin the unit of a TB, may become possible, unlike in the LTE system. Forthis, a terminal may transmit multi-bit HARQ-ACK feedback per TB.Further, during the retransmission, information may be provided ascontrol information for scheduling transmitted from the BS, indicatingwhat portion of the TB is being retransmitted.

When an outer code is used, data to be transmitted passes through asecond channel coding encoder 7-09. As a channel code used for secondchannel coding, e.g., a Reed-Solomon code, a broadcast channel (BCH)code, a raptor code, or a parity bit generation code may be used. Bitsor symbols that have passed through the second channel coding encoder7-09 pass through a first channel coding encoder 7-11. A channel codeused for first channel coding may be a convolutional code, an LDPC code,a turbo code, or a polar code.

When the channel coded symbols are received in a receiver, after passingthrough a channel 7-13, the receiver may successively operate a firstchannel coding decoder 7-15 and a second channel coding decoder 7-17based on the received signal. The first channel coding decoder 7-15 andthe second channel coding decoder 7-17 may perform operationscorresponding to the operations of the first channel coding encoder 7-11and the second channel coding encoder 7-09.

However, when the outer code is not used, although the first channelcoding encoder 7-11 and a first channel coding decoder 7-05 are used inthe transceiver, a second channel coding encoder and a second channelcoding decoder are not used. Even when the outer code is not used, thefirst channel coding encoder 7-11 and the first channel coding decoder7-05 may be configured in the same manner as when the outer code isused. FIG. 7A illustrates a block diagram in which the outer code is notused, showing a first channel encoder 7-01, a channel 7-03, and thefirst channel coding encoder 7-05.

Herein, an eMBB service is referred to as a first type service, and datafor eMBB is referred to as first type data. The first type service orthe first type data is not limited to the eMBB, but may correspond to ascenario in which high-speed data transmission is required or broadbandtransmission is performed. Further, a URLLC service is referred to as asecond type service, and data for URLLC is referred to as second typedata. The second type service or the second type data is not limited tothe URLLC, but may correspond to a scenario in which low latency isrequired or ultra-reliable transmission is necessary, or may correspondto another system in which both low-latency and ultra-reliability arerequired. Further, an mMTC service is referred to as a third typeservice, and data for mMTC is referred to as third type data. The thirdtype service or the third type data is not limited to the mMTC, but maycorrespond to a scenario in which a low speed, a wide coverage, or a lowpower is required. Further, the first type service may or may notinclude the third type service.

In order to transmit three types of services or data as described above,different physical layer channel structures may be used for therespective types. For example, at least one of a TTI length, a frequencyresource allocation unit, a control channel structure, and a datamapping method may differ.

Although three types of services and three types of data have beendescribed, more types of services and corresponding data may exist, andthe disclosure may be applied thereto.

As described above, an embodiment of the disclosure proposes a methodfor defining transmission/reception operations of a terminal and a BSfor transmitting first to third type services or data, and for operatingterminals that receive different types of services or data schedulingtogether in the same system. The first to third type terminals receivethe first to third type services or data scheduling. The first to thirdtype terminals may be the same terminals or different terminals.

FIGS. 8A, 8B, and 8C are diagrams of examples of partial retransmission,according to various embodiments of the disclosure.

Referring to FIG. 8A, a BS schedules eMBB data 8-03 to a terminal a byusing a control signal 8-01. Thereafter, when the eMBB data 8-03 istransmitted, a part 8-07 of a resource onto which the eMBB data is to bemapped is used to transmit other data 8-07 to the terminal a or anotherterminal b. Thereafter, a part 8-15 of the eMBB data that has beentransmitted or has not been transmitted to the terminal a isretransmitted to a next TTI 8-10. The unit of the partial retransmissionmay be a CB or a CB group including one or more CBs. The eMBB controlsignal 8-01 transfers scheduling information for the eMBB data 8-03 tothe terminal a. When URLLC data is generated during transmission of theeMBB data 8-03, the BS transmits a URLLC control signal and data toterminal b (8-07). The transmission of the URLLC control signal and datais performed through mapping of the URLLC control signal and the data8-07 onto a resource to be transmitted, without mapping a part of theexisting scheduled eMBB data 8-03 onto the resource. Accordingly, a partof the eMBB is not transmitted from the existing TTI 8-05. As a result,the eMBB terminal may fail to decode the eMBB data. To supplement this,a part of the eMBB data that is not transmitted at the TTI 8-05 istransmitted at the TTI 8-10 (8-13). The partial transmission isperformed at the TTI 8-10 after the initial transmission, and may beperformed without receiving HARQ-ACK information for the initialtransmission from the terminal. Through the partial transmission,scheduling information may be transferred from a control signal region8-09 of the next TTI. The control signal region 8-09 of the next TTI mayinclude information on a symbol location at which the resource mappingof the eMBB data or other data 8-17 starts when the eMBB data or otherdata 8-17 is transmitted to another terminal (8-11). The information maybe transferred from partial bits of DCI transmitted from the controlsignal region 8-09. Using the information on the symbol location atwhich resource mapping of the eMBB data or other data 8-17 starts, aspecific symbol performs partial transmission 8-15 for the previousinitial transmission. The eMBB control signal 8-01 or 8-09 of FIG. 8Amay not be transferred from the entire indicated region, but may betransferred only from the partial region. Further, it is also possibleto transfer the eMBB control signal 8-01 or 8-09 from a partialfrequency band other than the entire frequency band.

Although the partial retransmission 8-15 is performed at the next TTIsince a part of the eMBB is not transmitted for transmission of theURLLC data 8-07, the partial retransmission may be used in a manner thatthe BS optionally retransmits a specific part of data although it is notcaused by the URLLC data transmission. According to an embodiment, thepartial retransmission 8-15 may be discriminated as the initialtransmission of the corresponding part. That is, the terminal that hasreceived the partial retransmission 8-15 at the next TTI 8-10 does notperform HARQ decoding through combination with the received part at theprevious TTI 8-05, but may perform separate decoding using only thepartial retransmission 8-15 at the next TTI 8-10.

Further, although the retransmission is performed from a first symbolafter the control signal at the TTI 8-10 after the initial transmission,the location of the retransmission may be variously changed to beapplied, according to an embodiment. Although DL transmission has beendescribed in FIG. 8A as an example, the retransmission is alsoapplicable to UL transmission.

As shown in FIGS. 8B and 8C, CB2 and CB3 among 6 initially transmittedCBs are retransmitted. As such, only a partial CB of an initiallytransmitted TB or a CB-group (CBG) may be retransmitted in an NR system.

In the disclosure, a retransmission method of a CBG unit is described.In the disclosure, CBG unit retransmission, partial retransmission, andCBG retransmission may be interchangeably used.

As described above, when data is transmitted in a wireless communicationsystem, in particular, an LTE system, transmission is performed in unitsof TBs. A TB may be divided into a plurality of CBs, and channel codingis performed in units of CBs. Retransmission is performed after initialtransmission in units of TBs, and the entire TB need to be retransmittedeven when decoding of just one CB fails. Thus, there may be a case inwhich retransmission in units of CBs is required, and for this, a CBindex for notifying an order of CBs may be inserted into a CB to beoperated. According to an embodiment, a 5G or NR system may provide amethod and apparatus for performing retransmission in units of CBGs.

According to an embodiment, a TB may include a MAC header, a MAC CE, oneor more MAC SDUs, and padding bits. Further, the TB may indicate a unitof data downloaded from a MAC layer to a physical layer, or a MAC PDU.

According to an embodiment, after a CB included in a TB is channel-codedfor data transmission, resources where coded bits are mapped aredetermined. Here, the amount of resources where the CB is mapped may bedetermined such that amounts of resources used for CBs are the same asmuch as possible. When retransmission is performed in units of TBs likean LTE system, the number of transmitted CBs is determined according tothe CB included in the TB. However, when CBG retransmission isperformed, the number of transmitted CBs is determined via BSscheduling. Accordingly, a method of determining a region of resourceswhere coded bits of a CB based on a transmitted CB is required, andaccording to an embodiment, a method and apparatus for determining aregion of resources according to the number of actually transmitted CBsmay be provided.

When N_{CBG,max} denotes a CBG number or a maximum CBG number set by aBS with respect to a terminal, N_{CBG,max} and N_(CBG,max) may beinterchangeably used. Also, when the number of CBs included in ascheduled TB is C, an actual CBG number M when a TB is scheduled may bedetermined to be M=min(N_(CBG,max), C), and min(x, y) may denote asmaller value among x and y. C CBs included in a TB are grouped based ona following rule to form M CBGs.

-   -   First mod(C, M) CBGs each include ceil(C/M) or ┌C/M┐ CBs.    -   List M-mod(C,M) CBGs each include floor(C/M) or └C/M┘ CBs.

Here, ceil(C/M) or ┌C/M┐ denotes a minimum integer not lower than C/M,and floor(C/M) or └C/M┘ denotes a maximum integer that is not higherthan C/M. For example, when C/M is 4.3, ceil(C/M) is 5 and floor(C/M) is4. According to such a rule, CBs are grouped sequentially from the frontCBG.

As described above, when a maximum CBG number set with respect to aterminal is N_(CBG,max), DCI transmitted to schedule CBG unitretransmission may be set to include N_(CBG,max) bits for CBGtransmission information (CBGTI). The CBGTI may be an indicatorindicating which CBGs are transmitted in current scheduling. Forexample, when the BS set N_(CBG,max)=4 with respect to the terminal, oneTB may include maximum 4 CBGs, DCI may include 4 bits to indicate CBGTI,and each bit may indicate information about whether each CBG istransmitted. For example, when DCI includes bits of 1111 and there arefour CBGs, each bit is 1 and thus all CBG may be transmitted. As anotherexample, when DCI includes bits of 1100 and there are four CBGs, onlyfirst and second CBGs may be transmitted.

According to an embodiment, a method by which a terminal analyzes CBGTIis provided. In particular, a method of analyzing CBGTI when the numberof CBs included in a TB is lower than a set maximum CBG number isprovided.

N_{CBG,max} denotes a CBG number or a maximum CBG number set by a BSwith respect to a terminal. N_{CBG,max} and N_(CBG,max) may beinterchangeably used. Also, C denotes a number of CBs included in ascheduled TB. An actual CBG number M when a TB is scheduled may bedetermined to be M=min(N_(CBG,max), C), and min(x, y) may denote asmaller value among x and y. C CBs included in a TB are grouped based ona following rule to form M CBGs.

-   -   First mod(C, M) CBGs each include ceil(C/M) or ┌C/M┐ CBs.    -   List M-mod(C,M) CBGs each include floor(C/M) or └C/M┘ CBs.

Here, ceil(C/M) or ┌C/M┐ denotes a minimum integer not lower than C/M,and floor(C/M) or └C/M┘ denotes a maximum integer that is not higherthan C/M. For example, when C/M is 4.3, ceil(C/M) is 5 and floor(C/M) is4. According to such a rule, CBs are grouped sequentially from the frontCBG.

As described above, when a maximum CBG number set to a terminal isN_(CBG,max), DCI transmitted to schedule CBG unit retransmission may beset to include N_(CBG,max) bits for CBG transmission information(CBGTI). The CBGTI may be an indicator indicating which CBGs aretransmitted in current scheduling. For example, when the BS setN_(CBG,max)=4 with respect to the terminal, one TB may include maximum 4CBGs, DCI may include 4 bits to indicate CBGTI, and each bit mayindicate information about whether each CBG is transmitted. For example,when DCI includes bits of 1111 and there are four CBGs, each bit is 1and thus all CBG may be transmitted. As another example, when DCIincludes bits of 1100 and there are four CBGs, only first and secondCBGs may be transmitted.

When the number C of CBs included in the TB is smaller than N_(CBG,max)and thus the actual CBG number is equal to C, C bits from the front orthe back of the CBGTI may be valid bits, and in this case, the terminalignores the other bits of the CBGTI.

According to another embodiment, a method and apparatus for calculatinga length of coded bits of each CB, which is rate-matched, whentransmission is performed, are provided.

FIG. 9 is a block diagram for describing operations related to channelcoding performed until a TB to be transmitted is actually transmitted,according to an embodiment of the disclosure.

Referring to FIG. 9, when a TB to be transmitted is scheduled (9-01), atransport block size (TBS) of data to be transmitted is determined.Thereafter, a CRC is added to the TB, the TB is divided into CBsaccording to the TBS, and a CRC of a CB may be added (9-03). Channelcode encoding is performed on each CB (9-05), and coded bits to betransmitted are determined (9-07). For example, the amount of coded bitsto be transmitted is determined. Operation 9-07 may be referred to asrate-matching. Then, the coded bits to be transmitted from each CB aresequentially combined (9-09), and the combined bits are mapped to aphysical channel and transmitted (9-12). According to an embodiment, inoperation 9-07, a method of determining an amount of coded bitstransmitted from each CB considering a number of actually transmittedCBs and an information bit amount transmittable in physical resources isprovided.

[Start Rate-Matching Bit Number Determination or Transmission BitsCollection]

-   -   Operation 1: Er is defined such that a length of a rate-matching        result of an r-th CB is indicated. Here, r=0, 1, . . . , C−1.    -   Operation 2: G indicates information bits mappable for        transmitting a TB. For example, G may be calculated according to        the number of REs to which TB is mapped*modulation order*a layer        number. (G: total number of bits available for the transmission        of one transport block)    -   Operation 3: N_(L) is defined as the number of layers a TB is        mapped onto and Q may denote the number of coded bits per QAM        symbol. G′ is a value obtained by dividing G by N_(L) and Q,        that is, G′=G/(N_(L)·Q).    -   Operation 4: When scheduling DCI includes CBGTI, C′ denotes a        number of CBs indicated by the CBGTI and when scheduling DCI        does not include CBGTI, C′ denotes a number of CBs included in        the scheduled TB. By using the value obtained by dividing G′ by        C′, Er that is an amount of resources where the coded bits of        transmitted CBs are rate-matched is calculated. Here, Er denotes        a length of coded bits of an r-th CB, which is rate-matched.        Here, it is to be noted that C′ may not be the number of CBs        included in the scheduled TB. When only partial CBG is        transmitted, C′ may be smaller than the number of CBs included        in the TB.    -   Operation 5: Mapping information bits are configured such that        coded bits of CB are mapped only by the value Er of the length        of the rate-matching result of CB, calculated in operation 4.

[End Rate-Matching Bit Number Determination or Transmission BitsCollection]

In the above operations, operation 4 may be applied according topseudo-code 1 below.

[Start pseudo-code 1]

-   -   Operation 1-1: Set V=mod(G′,C′). C denotes a number of CBs        scheduled and transmitted, which is determined from a CBGTI        field and CB number information included in a TB, when the CBGTI        field exists in scheduling DCI, and denotes a number of CBs        included in the TB when the CBGTI field does not exist in the        scheduling DCI.    -   Operation 1-2:

   - set j=0.    While(r<C) or while(r≤C−1)    {if r-th CB is notscheduled (conditional statement 1-2-1)       set Er = 0     if r-th CBis scheduled (conditional statement 1-2-2),       if   j ≤ C − Y −1  (conditional  statement 1-2-3),  execute E_(r) = N_(L) · Q_(m) ·└G′/C′┘ and j=j+1.    if j > C − Y − 1 (conditional statement 1-2-4),execute E_(r) = N_(L) · Q_(m) · ┌G′/C′┐ and j=j+1.    } [End pseudo-code1]

FIG. 10 is a flowchart of a method of determining a rate matchingparameter, according to an embodiment of the disclosure.

In operation 1-1, C′ may be calculated according to the flowchart ofFIG. 10. When a process of determining C′ is started (10-02), whetherthe CBGTI field is included in the DCI is determined (10-04). C′ iscalculated based on a CBGTI field and a number C of CBs included in a TB(10-06) when DCI scheduling the TB includes the CBGTI field. When thescheduling DCI does not include the CBGTI field, C′ is set to the numberof CBs included in the TB, i.e., C′=C (10-10). Here, when the CBGTIfield is not included in the scheduling DCI, CBG unit retransmission maynot be set or a DCI format for a fall-back mode operation is useddespite the CBG unit retransmission being set. Alternatively, when theCBG unit retransmission is set and the CBGTI field is included in theDCI, but a terminal is defined to ignore the CBGTI field to perform anoperation defined in a fall-back mode, a method of setting C′ to C maybe applied.

As an example of operation 10-06, C′ may be calculated according toEquation 1 below.

$\begin{matrix}{C^{\prime} = {{\sum\limits_{i = 0}^{{{mod}{({C,M})}} - 1}{c_{i} \cdot \left\lceil {C\text{/}M} \right\rceil}} + {\sum\limits_{{mod}{({C,M})}}^{M - 1}{c_{i} \cdot \left\lfloor {C\text{/}M} \right\rfloor}}}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

In Equation 1, N_(CBG,max) denotes a maximum CBG number per TB set froma BS, C denotes a number of CBs included in a TB, and M calculated fromM=min(N_(CBG,max), C) denotes a CBG number actually included in a TB.When the number of CBs included in the TB is higher than a set maximumCBG number, the TB includes the number of CBGs equal to the set maximumCBG number, and when the number of CBs included in the TB is smallerthan or equal to the set maximum CBG number, the TB includes the numberof CBGs equal to the number of CBs and in this case, one CB is includedin the CBG. Here, c_(i) may denote an i-th bit value in the CBGTI field.P Alternatively, C′ may be calculated by using Equation 2 below insteadof Equation 1.

$\begin{matrix}{C^{\prime} = {{\sum\limits_{i = 0}^{{{mod}{({C,N_{{CBG},\max}})}} - 1}{c_{i} \cdot \left\lceil {C\text{/}N_{{CBG},\max}} \right\rceil}} + {\sum\limits_{{mod}{({C,N_{{CBG},\max}})}}^{N_{{CBG},\max} - 1}{c_{i} \cdot \left\lfloor {C\text{/}N_{{CBG},\max}} \right\rfloor}}}} & {{Equation}\mspace{14mu} 2}\end{matrix}$

In Equation 2, N_(CBG,max) denotes a maximum CBG number per TB set froma BS and C denotes a number of CBs included in a TB. Here, c_(i) maydenote an i-th bit value from a CBGTI field.

FIG. 11 is a flowchart of a method of determining a rate matchingparameter, according to another embodiment of the disclosure.

According to another embodiment, C′ may be calculated in operation 1-1according to the flowchart of FIG. 11. When a process of determining C′is started (11-02), it is determined whether transmission is CBG unittransmission based on information of scheduling DCI (11-04). The CBGunit transmission may be determined based on existence of a CBGTI fieldor based on a value of a 1-bit indicator of the DCI indicating CBG unittransmission or TB unit transmission. When the transmission is CBG unittransmission, C′ is set as a number of actually scheduled CBs (11-06).When the transmission is not CBG unit transmission, and a TB istransmitted, C′ is set as C (11-10), i.e., C′ is set to the number ofCBs included in the TB.

FIG. 12 is a flowchart of a method of determining a rate matchingparameter, according to another embodiment of the disclosure.

In operation 1-2 of pseudo-code 1, a process of determining Er may beperformed according to the flowchart of FIG. 12. After an r-th CB in aTB is encoded with channel coding, an amount Er of coded bits to betransmitted is determined (12-02). While calculating Er, it isdetermined whether the r-th CB is scheduled (12-04). When the schedulingis not CBG unit retransmission but an entire TB is transmitted, it maybe determined that all CBs have been scheduled. When the scheduling isCBG unit retransmission, it is determined whether the r-th CB isscheduled according to a CBGTI field. When the r-th CB is a scheduledCB, Er is determined based on a number C′ of scheduled CBs and mappableinformation amounts G and G′ (12-06). When the r-th CB is not scheduled,Er is set to Er=0 (12-10).

Pseudo-code 2 may be represented in the same manner as pseudo-code 1.

[Start pseudo-code 2]

-   -   Operation 2-1: Set V=mod(G′,C′), where C is the number of CBs        scheduled by a CBGTI field if it exists in a DCI, and where C is        the number C of CBs computed by CB segmentation of a TB if the        CBGTI field does not exist in the DCI.    -   Operation 2-2:

   Set j=0.    While(r<C) or while(r≤C−1)    If r-th CB is notscheduled, (conditional statement 2-2-1)       Er = 0    else(conditional statement 2-2-2),       If j ≤ C − Y − 1 (conditionalstatement 2-2-3), E_(r) = N_(L) · Q_(m) · └G′/C′┘ and j=j+1.       else(conditional statement 2-2-4), E_(r) = N_(L) · Q_(m) · ┌G′/C′┐       andj=j+1.       End if     End if    End while       [End pseudo-code 2]

Here, after obtaining Er, a process of combining coded bits of CBs,which is performed in operation 9-09 of FIG. 9, may be performed asfollows.

Set k = 0 and r = 0 while r < C    Set j = 0    while j < E_(r)      g_(k) = f_(rj)       k=k+1       j=j+1    end while    r=r+1 endwhile

Here, f^(rk) denotes a k-th coded bit to be transmitted from an r-th CB,g_(k) denotes information bits to be transmitted as coded bits of CBsare combined, and k is k=0, . . . , G−1.

According to another embodiment, a method and apparatus for calculatinga length of coded bits of each CB, which is rate-matched, whentransmission is performed, are provided.

Referring to FIG. 9, when a TB to be transmitted is scheduled (9-01), aTBS of data to be transmitted is determined. Thereafter, a CRC is addedto the TB, the TB is divided into CBs according to the TBS, and a CRC ofa CB may be added (9-03). Channel code encoding is performed on each CB(9-05), and coded bits to be transmitted are determined (9-07). Forexample, the amount of coded bits to be transmitted is determined.Operation 9-07 may be referred to as rate-matching. Then, the coded bitsto be transmitted from each CB are sequentially combined (9-09), and thecombined bits are mapped to a physical channel and transmitted (9-12).According to an embodiment, in operation 9-07, a method of determiningan amount of coded bits transmitted from each CB considering a number ofactually transmitted CBs and an information bit amount transmittable inphysical resources is provided.

[Start Rate-Matching Bit Number Determination or Transmission BitsCollection]

-   -   Operation 0: When CBGTI is included in scheduling DCI, C′        denotes a number of CBs indicated by the CBGTI, and when CBGTI        is not included in the scheduling DCI, C′ denotes a number of        CBs included in a scheduled TB. Here, it is to be noted that C′        may not be the number of CBs included in the scheduled TB. When        only a partial CBG is transmitted, C′ may be smaller than the        number of CBs included in the TB.    -   Operation 1: Er is defined such that a length of a rate-matching        result of an r-th CB among scheduled CBs is indicated. Here,        r=0, 1, . . . , C−1.    -   Operation 2: G indicates information bits mappable for        transmitting a TB. For example, G may be calculated according to        the number of REs to which TB is mapped*modulation order*a layer        number. (G: total number of bits available for the transmission        of one transport block)    -   Operation 3: N_(L) is defined as the number of layers a TB is        mapped onto and Q may denote the number of coded bits per QAM        symbol. G′ is a value obtained by dividing G by N_(L) and Q,        that is, G′=G/(N_(L)·Q).    -   Operation 4: By using the value obtained by dividing G′ by C′,        Er that is an amount of resources where the coded bits of        transmitted CBs are rate-matched is calculated.    -   Operation 5: Mapping information bits are configured such that        coded bits of CB are mapped only by the value Er of the length        of rate-matching result of CB, calculated in operation 4.

[End Rate-Matching Bit Number Determination or Transmission BitsCollection]

In the above operations, operation 4 may be applied according topseudo-code 3 below.

[Start pseudo-code 3]

-   -   Operation 3-1: Set V=mod(G′,C′). C denotes a number of CBs        scheduled and transmitted, which is determined from a CBGTI        field and CB number information included in a TB, when the CBGTI        field exists in scheduling DCI, and denotes a number of CBs        included in the TB when the CBGTI field does not exist in the        scheduling DCI.    -   Operation 3-2:

if j≤C−V−1 (conditional statement 1-2-3), executeE_(r)=N_(L)·Q_(m)·└G′/C′┘ and j=j+1.

if j≤C−V−1 (conditional statement 1-2-4), executeE_(r)=N_(L)·Q_(m)·┌G′/C┐ and j=j+1.

[End pseudo code 3]

According to an embodiment, C′ may be calculated in operation 3-1according to the flowchart of FIG. 10. When a process of determining C′is started (10-02), C′ is calculated based on a CBGTI field and a numberC of CBs included in a TB (10-06) when DCI scheduling the TB includesthe CBGTI field. When the scheduling DCI does not include the CBGTIfield, C′ is set to the number of CBs included in the TB, i.e., C′=C(10-10). Here, when the CBGTI field is not included in the schedulingDCI, CBG unit retransmission may not be set or a DCI format for afall-back mode operation is used despite the CBG unit retransmissionbeing set. Alternatively, when the CBG unit retransmission is set andthe CBGTI field is included in the DCI, but a terminal is defined toignore the CBGTI field to perform an operation defined in a fall-backmode, a method of setting C′ to C may be applied.

As an example of operation 10-06, C′ may be calculated according toEquation 1 or 2 above.

According to another embodiment, C′ may be calculated in operation 3-1according to the flowchart of FIG. 11. When a process of determining C′is started (11-02), it is determined whether transmission is CBG unittransmission based on information of scheduling DCI (11-04). The CBGunit transmission may be determined based on existence of a CBGTI fieldor based on a value of a 1-bit indicator of the DCI indicating CBG unittransmission or TB unit transmission. When the transmission is CBG unittransmission, C′ is set as a number of actually scheduled CBs (11-06).When the transmission is not CBG unit transmission, and a TB istransmitted, C′ is set as C (11-10), i.e., C′ is set to the number ofCBs included in the TB.

Pseudo-code 4 may be represented in the same manner as pseudo-code 3.

[Start pseudo-code 4]

Operation 4-1: set V=mod(G′,C′), where C is the number of code blocksscheduled by a CBGTI field if it exists in a DCI, and where C is thenumber C of code blocks computed by code block segmentation of a TB ifthe CBGTI field does not exist in the DCI.

-   -   Operation 4-2:

If j≤C−V−1 ((conditional statement 4-2-3), E_(r)=N_(L)·Q_(m)·└G′/C′┘ andj=j+1.

else (conditional statement 4-2-4), E_(r)=N_(L)·Q_(m)·┌G′/C┐ and j=j+1.

End if

[End pseudo code 4]

Here, after obtaining Er, a process of combining coded bits of CBs,which is performed in operation 9-09 of FIG. 9, may be performed asfollows.

Set k = 0 and r = 0 while r < C    Set j = 0    while j < E_(r)      g_(k) = f_(rj)       k=k+1       j=j+1    end while    r=r+1 endwhile

Here, f_(rk) denotes a k-th coded bit to be transmitted from an r-th CB,g_(k) denotes information bits to be transmitted as coded bits of CBsare combined, and k is k=0, . . . , G−1.

FIG. 13 is a block diagram of a structure of a terminal, according to anembodiment of the disclosure.

Referring to the FIG. 13, the terminal may include a transceiver 13-01,a memory 13-02, and a processor 13-03. The transceiver 13-01, the memory13-02, and the processor 13-03 of the terminal may operate according toa communication method of the terminal. However, not all of theillustrated components are essential. The terminal may be implemented bymore or less components than those illustrated in FIG. 13. In addition,the transceiver 13-01, the memory 13-02, and the processor 13-03 may beimplemented as a single chip.

The transceiver 13-01 may transmit or receive a signal to or from a BS.Here, the signal may include control information and data. In thisregard, the transceiver 13-01 may include a RF transmitter forup-converting and amplifying a frequency of a transmitted signal, and aRF receiver for amplifying low-noise and down-converting a frequency ofa received signal. However, components of the transceiver 13-01 are notlimited to the RF transmitter and the RF receiver.

Also, the transceiver 13-01 may receive and output a signal via awireless channel, and transmit a signal output from the processor 130-3via a wireless channel.

The memory 13-02 may store a program and data required for operations ofthe terminal. Also, the memory 13-02 may store control information ordata included in a signal obtained from the terminal. The memory 13-02may be configured as a storage medium, such as read-only memory (ROM),random access memory (RAM), a hard disk, a CD-ROM, and a digitalversatile disc (DVD), or a combination of storage media.

The processor 13-03 may control a series of processes such that theterminal operates according to embodiments described above. According toan embodiment, the processor 13-03 may receive DL control informationincluding CB transmission information, and determine the number of CBsbased on the CB transmission information. Also, the processor 13-03 mayreceive CBGTI information when the transceiver 13-01 receives a datasignal from a BS, determine rate-matching based on the number ofscheduled CBs, and perform a decoding process. Then, the transceiver13-01 may transmit HARQ-ACK information according to a CBG to the BS.

FIG. 14 is a block diagram of a structure of a BS, according to anembodiment of the disclosure.

Referring to FIG. 14, the BS may include a transceiver 14-01, a memory14-02, and a processor 14-03. The transceiver 14-01, the memory 14-02,and the processor 14-03 of the BS may operate according to acommunication method of the BS. However, not all of the illustratedcomponents are essential. The BS may be implemented by more or lesscomponents than those illustrated in FIG. 14. In addition, thetransceiver 14-01, the memory 14-02, and the processor 14-03 may beimplemented as a single chip.

The transceiver 14-01 may transmit or receive a signal to or from aterminal. Here, the signal may include control information and data. Inthis regard, the transceiver 14-01 may include a RF transmitter forup-converting and amplifying a frequency of a transmitted signal, and aRF receiver for amplifying low-noise and down-converting a frequency ofa received signal. However, components of the transceiver 14-01 are notlimited to the RF transmitter and the RF receiver.

The transceiver 14-01 may receive and output, to the processor 14-03, asignal through a wireless channel, and transmit a signal output from theprocessor 14-03 through the wireless channel.

The memory 14-02 may store a program and data required for operations ofthe BS. The memory 14-02 may store control information or data includedin a signal obtained by the BS. The memory 14-02 may be a storagemedium, such as ROM, RAM, a hard disk, a CD-ROM, and a DVD, or acombination of storage media.

The processor 14-03 may control a series of processes such that the BSoperates as described above. According to an embodiment, the processor14-03 may generate DL control signal including CB transmissioninformation, and transmit the DL control information to the terminal.Also, the processor 14-03 may determine the number of scheduled CBs,determine that each CB is rate-matched according to the number ofscheduled CBs, and control data to be mapped to a physical resource.Then, the transceiver 14-01 may transmit related scheduling controlinformation and data, and receive feedback information of CBGs.

According to one or more embodiments, a service may be smoothly providedin a wireless communication system.

Methods according to embodiments described in claims or specification ofthe disclosure may be implemented as hardware, software, or acombination of hardware and software.

When implemented as software, a non-transitory computer-readable storagemedium storing at least one program (software module) may be provided.The at least one program stored in the non-transitory computer-readablestorage medium is configured to be executable by one or more processorsin an electronic device. The one or more processors include instructionscausing the electronic device to execute the methods according toembodiments described in claims or specification of the disclosure.

The at least one program (the software module, the software) may bestored in a non-volatile including RAM and ROM, an electrically erasableprogrammable read-only memory (EEPROM), a magnetic disc storage device,CD-ROM, DVD, other optical storage devices, a magnetic cassette, or thelike, or a memory configured of any or all combinations thereof. Also,each of configuration memories may be provided in a multiple number.

The at least one program may be stored in an attachable storage devicethat can be accessed via a communication network including internet,intranet, a local area network (LAN), a wide LAN (WLAN), or a storagearea network (SAN), or a combination thereof. The storage device mayaccess, via an external port, an apparatus for performing embodiments ofthe disclosure. Also, a separate storage device on a communicationnetwork may access the apparatus for performing embodiments of thedisclosure.

In the embodiments of the disclosure, a component is expressed in asingular form or a plural form according to each specific embodiment.However, the singular or plural form is selected merely according to asuggested situation for convenience of description, and thus thedisclosure is not limited by single or plural components. Thus, aplurality of components may be a single component, or a single componentmay be a plurality of components.

It should be understood that embodiments described herein should beconsidered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould typically be considered as available for other similar featuresor aspects in other embodiments. Also, the embodiments described abovemay operate in combination with each other as occasion demands. Forexample, a BS and a terminal may operate with some of the embodimentscombined together. Also, the above embodiments are suggested based on anFDD LTE system, but other modifications based on the technical aspectsof the embodiments may be possible for other systems, such as TDD LTE,5G, and NR systems.

While the disclosure has been shown and described with reference tovarious embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing from the spirit and scope of the disclosure as definedby the appended claims and their equivalents.

What is claimed is:
 1. A method, performed by a base station, oftransmitting and receiving data in a wireless communication system, themethod comprising: determining whether a code block (CB), one of aplurality of CBs included in a transport block (TB), is scheduled for atransmission based on code block group transmission information (CBGTI);in response to the CB being scheduled for the transmission, determininga length of a sequence for the CB based on a number of CBs of the TB ora number of scheduled CBs of the TB; generating the sequence for the CBaccording to the determined length of the sequence; and transmitting asignal including the generated sequence.
 2. The method of claim 1,further comprising: in response to the CB not being scheduled for thetransmission, determining the length of a sequence for the CB as
 0. 3.The method of claim 1, further comprising: in response to the CBGTI notbeing present in downlink control information (DCI) scheduling of theTB, determining the length of the sequence for the CB based on thenumber of CBs of the TB; and in response to the CBGTI being present inthe DCI, determining the length of the sequence for the CB based on thenumber of scheduled CBs of the TB.
 4. The method of claim 3, wherein thelength of the sequence for the CB is determined as${{N_{L} \cdot Q_{m} \cdot \left\lfloor \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rfloor}\mspace{14mu}{or}\mspace{14mu}{N_{L} \cdot Q_{m} \cdot \left\lceil \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rceil}},$N_(L) is the number of transmission layers mapped with the TB, Q_(m) isthe modulation order, G is the total number of coded bits available fora transmission of the TB, C′ is the number of CBs of the TBs in responseto the CBGTI being not present in the DCI, and C′ is the number of thescheduled CBs of the TBs in response to the CBGTI being present in theDCI.
 5. A non-transitory computer-readable recording medium having anexecutable program recorded thereon, wherein the program instructs acomputer to perform the method of claim
 1. 6. A method, performed by auser equipment (UE) of transmitting and receiving data in a wirelesscommunication system, the method comprising: receiving code block grouptransmission information (CBGTI) for at least one code block (CB)included in a transport block (TB); determining a length of a sequencefor the at least one CB based on the number of CBs of the TB or thenumber of scheduled CBs of the TB according to the CBGTI; and decodingthe at least one CB based on the determined length of the sequence. 7.The method of claim 6, further comprising: in response to the CBGTI notbeing present in downlink control information (DCI) scheduling the TB,determining the length of the sequence for the CB based on the number ofCBs of the TB; and in response to the CBGTI being present in the DCI,determining the length of the sequence for the CB based on the number ofscheduled CBs of the TB.
 8. The method of claim 7, wherein the length ofthe sequence for the CB is determined as${{N_{L} \cdot Q_{m} \cdot \left\lfloor \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rfloor}\mspace{14mu}{or}\mspace{14mu}{N_{L} \cdot Q_{m} \cdot \left\lceil \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rceil}},$N_(L) is the number of transmission layers mapped with the TB, Q_(m) isthe modulation order, G is the total number of coded bits available fora transmission of the TB, C′ is the number of CBs of the TBs in responseto the CBGTI being not present in the DCI, and C′ is the number of thescheduled CBs of the TBs in response to the CBGTI being present in theDCI.
 9. A base station for transmitting and receiving data in a wirelesscommunication system, the base station comprising: a transceiver; atleast one memory storing instructions; and at least one processorconfigured to execute the stored instructions to: determine whether acode block (CB), one of a plurality of CBs included in a transport block(TB), is scheduled for a transmission based on code block grouptransmission information (CBGTI), in response to the CB being scheduledfor the transmission, determine a length of a sequence for the CB basedon a number of CBs of the TB or a number of scheduled CBs of the TB,generate the sequence for the CB according to the determined length ofthe sequence, and control the transceiver to transmit a signal includingthe generated sequence.
 10. The base station of claim 9, wherein the atleast one processor is further configured to execute the storedinstructions to: in response to the CB not being scheduled for thetransmission, determine the length of a sequence for the CB as
 0. 11.The base station of claim 9, wherein the at least one processor isfurther configured to execute the stored instructions to: in response tothe CBGTI not being present in downlink control information (DCI)scheduling of the TB, determine the length of a sequence for the CBbased on the number of CBs of the TB; and in response to the CBGTI beingpresent in the DCI, determine the length of the sequence for the CBbased on the number of scheduled CBs of the TB.
 12. The base station ofclaim 11, wherein the length of the sequence for the CB is determined as${{N_{L} \cdot Q_{m} \cdot \left\lfloor \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rfloor}\mspace{14mu}{or}\mspace{14mu}{N_{L} \cdot Q_{m} \cdot \left\lceil \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rceil}},$N_(L) is the number of transmission layers mapped with the TB, Q_(m) isthe modulation order, G is the total number of coded bits available fora transmission of the TB, C′ is the number of CBs of the TBs in responseto the CBGTI being not present in the DCI, and C′ is the number of thescheduled CBs of the TBs in response to the CBGTI being present in theDCI.
 13. A user equipment (UE) for transmitting and receiving data in awireless communication system, the UE comprising: a transceiver; atleast one memory storing instructions; and at least one processorconfigured to execute the stored instructions to: receive code blockgroup transmission information (CBGTI) for at least one code block (CB)included in a transport block (TB), determine a length of a sequence forthe at least one CB based on a number of CBs of the TB or a number ofscheduled CBs of the TB according to the CBGTI, and decode the at leastone CB based on the determined length of the sequence.
 14. The UE ofclaim 13, wherein the at least one processor is further configured toexecute the stored instructions to: in response to the CBGTI not beingpresent in downlink control information (DCI) scheduling of the TB,determine the length of a sequence for the CB based on the number of CBsof the TB; and in response to the CBGTI being present in the DCI,determine the length of the sequence for the CB based on the number ofscheduled CBs of the TB.
 15. The UE of claim 14, wherein the length ofthe sequence for the CB is determined as${{N_{L} \cdot Q_{m} \cdot \left\lfloor \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rfloor}\mspace{14mu}{or}\mspace{14mu}{N_{L} \cdot Q_{m} \cdot \left\lceil \frac{G}{N_{L} \cdot Q_{m} \cdot C^{\prime}} \right\rceil}},$N_(L) is the number of transmission layers mapped with the TB, Q_(m) isthe modulation order, G is the total number of coded bits available fora transmission of the TB, C′ is the number of CBs of the TBs in responseto the CBGTI being not present in the DCI, and C′ is the number of thescheduled CBs of the TBs in response to the CBGTI being present in theDCI.